We present two models for the multiwavelength emission of Tycho, which both adequately fit the SED.
Model I allows for the weakest magnetic field in the immediate downstream region of the shock, \(B_2 = 150\, \mathrm {\mu G}\) , that is compatible with the entire \(\gamma \) -ray flux observed with Fermi-LAT in GeV-range and VERITAS in TeV-band [1]}. In Model I, the resulting \(\gamma \) -ray flux consists of both leptonic and hadronic components. The magnetic
profile deeper inside the remnant is determined by advection of frozen-in magnetic field and corresponds to the MHD solution for
negligible magnetic pressure and energy density. As we shall demonstrate, this model fails to explain radio and X-ray intensity profiles.
